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A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds....

Physics
JAMB 1983
A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevalling condition is 250ms -1, how much closer is the ship to the cliff?
  • A. 10m
  • B. 125m
  • C. 175m
  • D. 350m
  • E. 1,000m
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Correct Answer: Option B
Explanation
Difference in time = 1 sec.

echo time = 1 \(\div\) 2 = 0.5 sec.

= 0.5 x 250

= 125m
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